US7599650B2 - Developer bearing member, developing device, process cartridge and image forming apparatus - Google Patents
Developer bearing member, developing device, process cartridge and image forming apparatus Download PDFInfo
- Publication number
- US7599650B2 US7599650B2 US11/554,360 US55436006A US7599650B2 US 7599650 B2 US7599650 B2 US 7599650B2 US 55436006 A US55436006 A US 55436006A US 7599650 B2 US7599650 B2 US 7599650B2
- Authority
- US
- United States
- Prior art keywords
- developer
- bearing member
- latent image
- toner
- developing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
Abstract
Description
0.38 Vd/Vi (mm)≦b≦1.1 Vd/Vi (mm),
wherein Vd represents the linear velocity of the surface of the developer bearing member, and Vi represents the linear velocity of the surface of the rotated image bearing member.
SF-1={(MXLNG)2/(AREA)}×(100π/4) (1)
wherein MXLNG represents a diameter of the circle circumscribing the image of a toner particle, which image is obtained by observing the toner particle with a microscope; and AREA represents the area of the image.
SF-2={(PERI)2/(AREA)}×(100/4π) (2)
wherein PERI represents the peripheral length of the image of a toner particle observed by a microscope; and AREA represents the area of the image.
- (1) particles of a toner are photographed using a scanning electron microscope (S-800, manufactured by Hitachi Ltd.); and
- (2) photograph images of 100 toner particles are analyzed using an image analyzer (LUZEX 3 manufactured by Nireco Corp.) to determine the first and second shape factors SF-1 and SF-2.
0.38 Vd/Vi≦b (mm)≦1.1 Vd/Vi,
wherein Vd represents the linear velocity of the surface of the rotated developer bearing member, and Vi represents the linear velocity of the surface of the rotated image bearing member.
TABLE 1 | |
Slanting | |
angle | Shape of |
1. Narrow V- |
2. Medium | 3. Wide | ||
grooves | grooves | grooves | ||
|
|
|
||
Width: 160 μm | Width: 300 μm | Width: 450 μm | ||
Depth: 80 μm | Depth: 80 μm | Depth: 80 |
||
15° | | Good | Good | |
25° | Good | Good | Good | |
35° | | Good | Good | |
40° | Good | Good | Good | |
45° | Not | Not | Not | |
acceptable | acceptable | acceptable | ||
50° | Not | Not | Not | |
acceptable | acceptable | acceptable | ||
Good: The developing roller could bear a proper amount of developer thereon during the test in which 160,000 copies are produced. | ||||
Not acceptable: The weight of developer on the surface of the developing roller became lower than the lower limit before the test was completed. |
TABLE 2 | ||
First intersection | Second intersection | |
Slanting angle (°) | distance (a) (mm) | distance (b) (mm) |
15 | 5.26 | 1.41 |
25 | 3.02 | 1.41 |
35 | 2.01 | 1.41 |
40 | 1.68 | 1.41 |
45 | 1.41 | 1.41 |
50 | 1.18 | 1.41 |
-
- Diameter of developing roller: 18 mm
- Linear velocity of photoreceptor: 150 mm/s
- Linear velocity of developing sleeve: 290 mm/s
- Number of grooves: 80 (40+40 (reversely slanting grooves))
18×π/40=1.41 (mm)
tan (θ)(or tan (θ′))=a/b.
-
- Diameter of developing roller: 18 mm
- First intersection distance (a): changed in a range of from 1.3 mm to 4.8 mm.
- Second intersection distance (b): changed in a range of from 0.75 mm to 2.2 mm.
-
- Diameter of developing roller: 18 mm
- Number of grooves: 80 (40+40 (reversely slanting grooves))
- Slanting angle (θ or θ′): 25°
- Angle of vertical wall of groove: 90°
- Width of groove: 240 μm
- Depth of groove: 90 μm
- Weight of developer drawn by sleeve: 48 mg/cm2 (±8 mg/cm2)
- Doctor gap: 0.34 mm
- Gap between surface of developing sleeve and surface of photoreceptor (development gap): 0.3 mm (±0.05 mm)
y=0.15x
wherein y represents the synthesized deviation in depth of the grooves and x represents the development gap.
CR={c/(1−c)}×(R/r)3×(ρc/ρt)×(31/2/2π)×{r/(R+r)}2
wherein R represents the particle diameter of the carrier particle; r represents the particle diameter of the toner particles on the carrier particle; ρc represents the true specific gravity of the carrier particle; ρt represents the true specific gravity of the toner particles; and c represents the concentration (% by weight) of the toner in the developer.
Claims (54)
0.38 Vd/Vi (mm)≦b≦1.1 Vd/Vi (mm),
0.38 Vd/Vi (mm)≦b≦1.1 Vd/Vi (mm),
0.38 Vd/Vi (mm)≦b≦1.1 Vd/Vi (mm),
Applications Claiming Priority (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005321625A JP2007127903A (en) | 2005-11-04 | 2005-11-04 | Image forming apparatus |
JP2005321629A JP4628932B2 (en) | 2005-11-04 | 2005-11-04 | Image forming apparatus |
JP2005321627A JP2007127905A (en) | 2005-11-04 | 2005-11-04 | Image forming apparatus |
JP2005321628A JP2007127906A (en) | 2005-11-04 | 2005-11-04 | Image forming apparatus |
JP2005321626A JP2007127904A (en) | 2005-11-04 | 2005-11-04 | Image forming apparatus |
JP2005-321626 | 2005-11-04 | ||
JP2005-321625 | 2005-11-04 | ||
JP2005-321627 | 2005-11-04 | ||
JP2005-321629 | 2005-11-04 | ||
JP2005-321628 | 2005-11-04 | ||
JP2005345049A JP4689450B2 (en) | 2005-11-30 | 2005-11-30 | Image forming apparatus |
JP2005-345049 | 2005-11-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070104516A1 US20070104516A1 (en) | 2007-05-10 |
US7599650B2 true US7599650B2 (en) | 2009-10-06 |
Family
ID=38003880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/554,360 Expired - Fee Related US7599650B2 (en) | 2005-11-04 | 2006-10-30 | Developer bearing member, developing device, process cartridge and image forming apparatus |
Country Status (1)
Country | Link |
---|---|
US (1) | US7599650B2 (en) |
Cited By (15)
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US20080205942A1 (en) * | 2007-02-27 | 2008-08-28 | Seiko Epson Corporation | Developing Roller, Developing Unit, and Image Forming Apparatus |
US20090060591A1 (en) * | 2007-09-04 | 2009-03-05 | Ricoh Company, Ltd. | Developing roller, developing device, process cartridge, and image forming apparatus |
US20090148197A1 (en) * | 2007-12-05 | 2009-06-11 | Seiko Epson Corporation | Developer Apparatus, An Image Forming Apparatus and An Image Forming Method |
US20090148195A1 (en) * | 2007-12-06 | 2009-06-11 | Kabushiki Kaisha Toshiba | Developing roller, developing apparatus, and image forming apparatus |
US20100040395A1 (en) * | 2005-12-20 | 2010-02-18 | Seiko Epson Corporation | Developing system and image forming apparatus using the same |
US20100111572A1 (en) * | 2008-11-04 | 2010-05-06 | Eisuke Hori | Development device, process cartridge, and image forming apparatus |
US20110064473A1 (en) * | 2009-09-15 | 2011-03-17 | Tetsumaru Fujita | Image forming apparatus |
US20110170915A1 (en) * | 2010-01-13 | 2011-07-14 | Mitsuo Aoki | Two-component developing method and developer used therefor |
US20110217085A1 (en) * | 2010-03-04 | 2011-09-08 | Yoshio Hattori | Developing apparatus, process cartridge, and image forming apparatus |
US20120057907A1 (en) * | 2010-09-03 | 2012-03-08 | Nobuyuki Taguchi | Development device, process cartridge, and image forming apparatus including same |
US20130108328A1 (en) * | 2011-11-02 | 2013-05-02 | Canon Kabushiki Kaisha | Image forming apparatus |
US8781375B2 (en) | 2010-10-21 | 2014-07-15 | Ricoh Company, Limited | Powder container, powder conveying apparatus, and image forming apparatus |
US8824932B2 (en) | 2010-02-10 | 2014-09-02 | Ricoh Company, Ltd. | Development device, and process cartridge and image forming apparatus incorporating same |
US8918030B2 (en) | 2008-11-27 | 2014-12-23 | Ricoh Company, Limited | Powder supplying device and image forming apparatus |
US20170219954A1 (en) * | 2014-11-05 | 2017-08-03 | Ricoh Company, Ltd. | Developing roller, process cartridge, image forming apparatus and image forming method |
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EP1988430B1 (en) * | 2007-04-30 | 2016-06-08 | Xeikon Manufacturing | Method of printing or copying with spherical toner particles |
US7890031B2 (en) | 2007-08-10 | 2011-02-15 | Ricoh Company, Ltd. | Developing device and process cartridge used in image forming apparatus |
US7995934B2 (en) * | 2007-09-20 | 2011-08-09 | Ricoh Company, Limited | Developing device, image forming apparatus, and process unit |
JP4907504B2 (en) * | 2007-11-26 | 2012-03-28 | 株式会社リコー | Image forming apparatus |
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JP4618303B2 (en) * | 2008-01-23 | 2011-01-26 | セイコーエプソン株式会社 | Toner carrying roller manufacturing method, developing device, and image forming apparatus |
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JP2005037878A (en) | 2003-06-26 | 2005-02-10 | Ricoh Co Ltd | Development apparatus, image forming apparatus, processing cartridge, and development method |
US6859634B2 (en) | 2002-01-31 | 2005-02-22 | Ricoh Company, Ltd. | Toner refilling device and developing device using the same for an image forming apparatus |
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---|---|---|---|---|
US20100040395A1 (en) * | 2005-12-20 | 2010-02-18 | Seiko Epson Corporation | Developing system and image forming apparatus using the same |
US7917065B2 (en) * | 2005-12-20 | 2011-03-29 | Seiko Epson Corporation | Image forming apparatus that collects and filters excess liquid developer |
US20080205942A1 (en) * | 2007-02-27 | 2008-08-28 | Seiko Epson Corporation | Developing Roller, Developing Unit, and Image Forming Apparatus |
US20090060591A1 (en) * | 2007-09-04 | 2009-03-05 | Ricoh Company, Ltd. | Developing roller, developing device, process cartridge, and image forming apparatus |
US7925192B2 (en) * | 2007-09-04 | 2011-04-12 | Ricoh Company, Ltd. | Developing roller, developing device, process cartridge, and image forming apparatus |
US8027624B2 (en) | 2007-12-05 | 2011-09-27 | Seiko Epson Corporation | Developer apparatus, an image forming apparatus and an image forming method |
US20090148197A1 (en) * | 2007-12-05 | 2009-06-11 | Seiko Epson Corporation | Developer Apparatus, An Image Forming Apparatus and An Image Forming Method |
US20090148195A1 (en) * | 2007-12-06 | 2009-06-11 | Kabushiki Kaisha Toshiba | Developing roller, developing apparatus, and image forming apparatus |
US7970322B2 (en) * | 2007-12-06 | 2011-06-28 | Kabushiki Kaisha Toshiba | Developing roller, developing apparatus, and image forming apparatus |
US20100111572A1 (en) * | 2008-11-04 | 2010-05-06 | Eisuke Hori | Development device, process cartridge, and image forming apparatus |
US7974556B2 (en) | 2008-11-04 | 2011-07-05 | Ricoh Company Limited | Development device, process cartridge, and image forming apparatus |
US8918030B2 (en) | 2008-11-27 | 2014-12-23 | Ricoh Company, Limited | Powder supplying device and image forming apparatus |
US20110064473A1 (en) * | 2009-09-15 | 2011-03-17 | Tetsumaru Fujita | Image forming apparatus |
US8452216B2 (en) | 2009-09-15 | 2013-05-28 | Ricoh Company, Limited | Image forming apparatus which mixes new unused toner with used old toner |
US20110170915A1 (en) * | 2010-01-13 | 2011-07-14 | Mitsuo Aoki | Two-component developing method and developer used therefor |
US8385790B2 (en) | 2010-01-13 | 2013-02-26 | Ricoh Company, Limited | Two-component developing method and developer used therefor |
US8824932B2 (en) | 2010-02-10 | 2014-09-02 | Ricoh Company, Ltd. | Development device, and process cartridge and image forming apparatus incorporating same |
US20110217085A1 (en) * | 2010-03-04 | 2011-09-08 | Yoshio Hattori | Developing apparatus, process cartridge, and image forming apparatus |
US8676099B2 (en) | 2010-03-04 | 2014-03-18 | Ricoh Company, Ltd. | Developing apparatus, process cartridge, and image forming apparatus |
US8682230B2 (en) * | 2010-09-03 | 2014-03-25 | Ricoh Company, Ltd. | Development device, process cartridge, and image forming apparatus including same having multiple recesses formed on a developer bearer |
US20120057907A1 (en) * | 2010-09-03 | 2012-03-08 | Nobuyuki Taguchi | Development device, process cartridge, and image forming apparatus including same |
US8781375B2 (en) | 2010-10-21 | 2014-07-15 | Ricoh Company, Limited | Powder container, powder conveying apparatus, and image forming apparatus |
US20130108328A1 (en) * | 2011-11-02 | 2013-05-02 | Canon Kabushiki Kaisha | Image forming apparatus |
US20170219954A1 (en) * | 2014-11-05 | 2017-08-03 | Ricoh Company, Ltd. | Developing roller, process cartridge, image forming apparatus and image forming method |
US9983505B2 (en) * | 2014-11-05 | 2018-05-29 | Ricoh Company, Ltd. | Developing roller, process cartridge, image forming apparatus and image forming method |
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